Do not allow GLContextVirtual::MakeCurrent() without a decoder (state
restorer), since this only leads to state bugs.
For this reason remove the necessity of having a current context during surface destruction (it's ugly anyway, since GLSurface is RefCounted).
BUG=248395
Review URL: https://chromiumcodereview.appspot.com/15925007
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205481 0039d316-1c4b-4281-b951-d872f2087c98